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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.jmx.internal;

import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Map;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import org.hibernate.HibernateException;
import org.hibernate.cfg.AvailableSettings;
import org.hibernate.cfg.Environment;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.jmx.spi.JmxService;
import org.hibernate.service.Service;
import org.hibernate.service.spi.Manageable;
import org.hibernate.service.spi.Stoppable;

/**
 * Standard implementation of JMX services
 *
 * @author Steve Ebersole
 */
public class JmxServiceImpl implements JmxService, Stoppable {
	private static final CoreMessageLogger LOG = CoreLogging.messageLogger( JmxServiceImpl.class );

	public static final String OBJ_NAME_TEMPLATE = "%s:sessionFactory=%s,serviceRole=%s,serviceType=%s";

	private final boolean usePlatformServer;
	private final String agentId;
	private final String defaultDomain;
	private final String sessionFactoryName;

	public JmxServiceImpl(Map configValues) {
		usePlatformServer = ConfigurationHelper.getBoolean( AvailableSettings.JMX_PLATFORM_SERVER, configValues );
		agentId = (String) configValues.get( AvailableSettings.JMX_AGENT_ID );
		defaultDomain = (String) configValues.get( AvailableSettings.JMX_DOMAIN_NAME );
		sessionFactoryName = ConfigurationHelper.getString(
				AvailableSettings.JMX_SF_NAME,
				configValues,
				ConfigurationHelper.getString( Environment.SESSION_FACTORY_NAME, configValues )
		);
	}

	private boolean startedServer;
	private ArrayList registeredMBeans;

	@Override
	public void stop() {
		try {
			// if we either started the JMX server or we registered some MBeans we at least need to look up
			// MBean server and do *some* work on shutdown.
			if ( startedServer || registeredMBeans != null ) {
				MBeanServer mBeanServer = findServer();
				if ( mBeanServer == null ) {
					LOG.unableToLocateMBeanServer();
					return;
				}

				// release any MBeans we registered
				if ( registeredMBeans != null ) {
					for ( ObjectName objectName : registeredMBeans ) {
						try {
							LOG.tracev( "Unregistering registered MBean [ON={0}]", objectName );
							mBeanServer.unregisterMBean( objectName );
						}
						catch ( Exception e ) {
							LOG.debugf( "Unable to unregsiter registered MBean [ON=%s] : %s", objectName, e.toString() );
						}
					}
				}

				// stop the MBean server if we started it
				if ( startedServer ) {
					LOG.trace( "Attempting to release created MBeanServer" );
					try {
						MBeanServerFactory.releaseMBeanServer( mBeanServer );
					}
					catch ( Exception e ) {
						LOG.unableToReleaseCreatedMBeanServer( e.toString() );
					}
				}
			}
		}
		finally {
			startedServer = false;
			if ( registeredMBeans != null ) {
				registeredMBeans.clear();
				registeredMBeans = null;
			}
		}
	}


	// todo : should serviceRole come first in ObjectName template?  depends on the groupings we want in the UI.
	// 		as-is mbeans from each sessionFactory are grouped primarily.

	@Override
	public void registerService(Manageable service, Class serviceRole) {
		final String domain = service.getManagementDomain() == null
				? AvailableSettings.JMX_DEFAULT_OBJ_NAME_DOMAIN
				: service.getManagementDomain();
		final String serviceType = service.getManagementServiceType() == null
				? service.getClass().getName()
				: service.getManagementServiceType();
		try {
			final ObjectName objectName = new ObjectName(
					String.format(
							OBJ_NAME_TEMPLATE,
							domain,
							sessionFactoryName,
							serviceRole.getName(),
							serviceType
					)
			);
			registerMBean( objectName, service.getManagementBean() );
		}
		catch ( MalformedObjectNameException e ) {
			throw new HibernateException( "Unable to generate service IbjectName", e );
		}
	}

	@Override
	public void registerMBean(ObjectName objectName, Object mBean) {
		MBeanServer mBeanServer = findServer();
		if ( mBeanServer == null ) {
			if ( startedServer ) {
				throw new HibernateException( "Could not locate previously started MBeanServer" );
			}
			mBeanServer = startMBeanServer();
			startedServer = true;
		}

		try {
			mBeanServer.registerMBean( mBean, objectName );
			if ( registeredMBeans == null ) {
				registeredMBeans = new ArrayList();
			}
			registeredMBeans.add( objectName );
		}
		catch ( Exception e ) {
			throw new HibernateException( "Unable to register MBean [ON=" + objectName + "]", e );
		}
	}

	/**
	 * Locate the MBean server to use based on user input from startup.
	 *
	 * @return The MBean server to use.
	 */
	private MBeanServer findServer() {
		if ( usePlatformServer ) {
			// they specified to use the platform (vm) server
			return ManagementFactory.getPlatformMBeanServer();
		}

		// otherwise lookup all servers by (optional) agentId.
		// IMPL NOTE : the findMBeanServer call treats a null agentId to mean match all...
		ArrayList mbeanServers = MBeanServerFactory.findMBeanServer( agentId );

		if ( defaultDomain == null ) {
			// they did not specify a domain by which to locate a particular MBeanServer to use, so chose the first
			return mbeanServers.get( 0 );
		}

		for ( MBeanServer mbeanServer : mbeanServers ) {
			// they did specify a domain, so attempt to locate an MBEanServer with a matching default domain, returning it
			// if we find it.
			if ( defaultDomain.equals( mbeanServer.getDefaultDomain() ) ) {
				return mbeanServer;
			}
		}

		return null;
	}

	private MBeanServer startMBeanServer() {
		try {
			return MBeanServerFactory.createMBeanServer( defaultDomain );
		}
		catch ( Exception e ) {
			throw new HibernateException( "Unable to start MBeanServer", e );
		}
	}
}